Never heard of it at the resorts but my DD was picked to be Chef for the Day at the Coral Reef restaurant in Epcot. She wore a white coat and a chef's hat for the meal, had a table by the fish tank without even asking, and got to meet the chef and he presented her with a free dessert of peanut butter playdough! The divers spent quite a bit of time swimming past our table and feeding the fish for her to see too. She also got a certificate and had her pic taken for their album!
I also know they have cookies for dessert at certain restaurants that come with edible paints and decos. Sophia had one at the buffet in Norway. We paid for that though.
I am sure this doesn't help you but it's the best I have.